Search for pair-produced neutralinos in events with photons and missing energy from ▫$e^+e^-$▫ collisions at ▫$\sqrt s=130-183 GeV$▫
Abreu, P. ...
The events with two photons and missing (transverse) energy collected by the DELPHI detector at centre-of-mass energies between 130 GeV and 183 GeV have been studied to search for processes of the ...type e[sup]+e[sup]-[to]YY with the subsequent decay Y[to]X[sub][gamma], where X is an undetectable neutral particle. Reactions of this kind are expected in supersymmetric models, where the Y particle can be either the lightest neutralino, decaying to a photon and a gravitino, or the next-to-lightest neutralino, decaying to a photon and the lightest neutralino. To study the case of long-lived Y particles, a search for single-photon events with the reconstructed photon axis pointing far from the beam interaction region has also been performed. No evidence for a deviation from Standard Model expectations has been observed in the data and upper limits have been derived on the signal cross-section as a function of the X and Y masses and of the Y mean decay path.
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